item is ATT (RF-Attenuator) that controls strength of electric wave

Because the mini FM station has been approved by providing for a slight wireless station it is necessary to observe Radio Law provided in "Definition of an unnecessary, slight electric wave of the license" strictly.

Transmitted electric field strength to regulations in the inside when strength of the electric wave discharged from the antenna (electric field strength) is strong It is necessary to adjust it.
in this case transmitter output changeable familiarize drop at drop output changeable occurrence install FM transmitter antenna send output limit

ATT(RF-Attenuator) =(device that attenuates the electric wave) can freely set the output only by connecting it with the output terminal even if the output of the transmitter doesn't changeable occur.
Moreover, the output of the transmitter is stabilized to changeable far and attenuation by impedance is obtained.
The output of the transmitter though impedance becomes unstable in case of changeability
The output can be dropped by impedance that studies place thoroughly and is steady that uses ATT.

it is for N type terminal on the photograph and the under is for the terminal BNC, and the amount of attenuation is a thing of 10dB and made by the Mini-Circuit company.

As for the amount of attenuation, of ATT, various things are marketed by various electric power and amounts of attenuation such as 3dB(1/2), 6dB(1/4), 10dB(1/10), and 20dB(1/100) used. it is possible to obtain a necessary amount of attenuation if it combines and it uses it.
 
 

Reference HP link  Mini-Circuit company.

 

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